I also have to ask what size the box is?
When Jannah had her puppies at first she was in a small rubbermaid storage bin,and she didn't like it at all cause it WAS too small for her and the puppies. Then we moved her to a really large box almost the size of a refrigerator box but a bit smaller..and she liked that one much better causer she could actually move around.
I must admit though, I had her and her puppies on my bed with me the majority of the time. I even had the box on my bed, and just slept on the very edge of it so her and her puppies were comfy. And when they got older, they pretty much lived on my bed until they started pooing on their own, then I had to put them down in their x-pen. But there were not any problems with them on my bed. Not that I recommend it for safety reasons. (I was 15 at the time too, and didn't really think. "Hey, I could injure them if I rolled over on them"). So definitely don't do that.